13003121321 has 2 divisors, whose sum is σ = 13003121322. Its totient is φ = 13003121320.

The previous prime is 13003121317. The next prime is 13003121359. The reversal of 13003121321 is 12312130031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8960704921 + 4042416400 = 94661^2 + 63580^2 .

It is a cyclic number.

It is not a de Polignac number, because 13003121321 - 2² = 13003121317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13003121321.

It is not a weakly prime, because it can be changed into another prime (13003121311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6501560660 + 6501560661.

It is an arithmetic number, because the mean of its divisors is an integer number (6501560661).

Almost surely, 2^13003121321 is an apocalyptic number.

It is an amenable number.

13003121321 is a deficient number, since it is larger than the sum of its proper divisors (1).

13003121321 is an equidigital number, since it uses as much as digits as its factorization.

13003121321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 13003121321 its reverse (12312130031), we get a palindrome (25315251352).

The spelling of 13003121321 in words is "thirteen billion, three million, one hundred twenty-one thousand, three hundred twenty-one".